CN202583394U - Electrical network earth fault line-selecting device - Google Patents
Electrical network earth fault line-selecting device Download PDFInfo
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- CN202583394U CN202583394U CN201220251347.XU CN201220251347U CN202583394U CN 202583394 U CN202583394 U CN 202583394U CN 201220251347 U CN201220251347 U CN 201220251347U CN 202583394 U CN202583394 U CN 202583394U
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Abstract
The present utility model relates to a novel resonance grounding system single-phase earth fault line-selecting device which belongs to the low current fault line-selecting technology field. A signal input interface and an output interface are arranged on the back side of the device; a communication interface is arranged on the side surface; a display screen and an operation panel are arranged on the front side; a button, a signal lamp and a power supply switch are arranged on the operation panel; a mainboard is fixed on the bottom part and provided with a plurality of slots; acquisition plates are inserted into the slots of the mainboard, each acquisition plate is an L-shaped structure; a power supply module is arranged on the end part of the mainbaord; and installing plates and installing holes are arranged on two sides of the front side of the device. In the device, voltage and current signals of a line are adopted to calculate instantaneous power, when a system is subjected to single-phase grounding, a fault line is selected through comprehensively comparing and analyzing variation of instantaneous energy of each line, fault information can be displayed, and an alarm signal and a trip-out signal can be given out, and the device can be used for realizing intelligent fault line-selecting, and is expandable in functions, compact in structure, convenient to operate and practical.
Description
Technical field
The utility model relates to a kind of novel resonant earthed system single-phase earth fault line selection device, belongs to low current fault route selection technical field.
Background technology
Neutral by arc extinction coil grounding is the mode that extensively adopts in the present low and medium voltage distribution network, and this earthing mode has the high advantage of power supply reliability.The neutral by arc extinction coil grounding system also claims resonant earthed system, and the most faults that take place in this system are singlephase earth faults., singlephase earth fault do not form short-circuit loop in the system when taking place; The very little zero-sequence current that has only system's distributed capacitance to cause, three alternate voltages be symmetry still, does not influence system's operate as normal; China's electric power rules regulation, system can be with singlephase earth fault to continue operation 1 ~ 2 hour.But during resonant earthed system generation singlephase earth fault, non-fault phase-to-ground voltage raises; Insulation is threatened; Insulation ag(e)ing is quickened in the long-time running meeting, and system possibly punctured in other position of circuit once more under the effect of fault high pressure, forms multipoint earthing; Cause short-circuit current paths, cause power failure.In addition, if when intermittent arc grounding takes place, the insulation damages that high arc temperature can cause lead and close on develops into phase fault.Therefore, must find faulty line as early as possible when earth fault takes place, fix a breakdown as early as possible.
On the other hand, behind the resonance grounding electrical network generation singlephase earth fault, because earth point only produces the weak capacitive electric current, factor influences such as electric arc instability, boundary condition complicacy in addition make the fault ground capacitance current be difficult to identification.And unbalanced distribution system also can produce unbalanced zero-sequence current when normal operation, and what this made faulty line detects comparison difficulty, the line selection apparatus of short of reliable selection method and pin-point accuracy always.Yet; During resonance grounding electrical network generation singlephase earth fault; Fault phase capacitor discharge and the charging of non-fault phase electric capacity produce the amplitude transient current bigger several times to tens times than steady-state value, cause the energy delivery on the circuit to have greatly changed; Utilize the relative variation of faulty line and non-fault line instantaneous energy, can accurately select failure line selection.
The utility model content
To the problems referred to above, the utility model provides a kind of novel fault line selection device, utilizes the voltage and current signal on the circuit; Calculate instantaneous power; When system's generation single-phase earthing, select faulty line through the variable quantity of instantaneous energy on each circuit of comprehensive compare of analysis, and show failure message; Send alerting signal and trip signal, advantage such as having intelligent trouble route selection, function can expansion, compact conformation, easy to operate, practicality.
The utility model technical scheme is: fault line selection device is by guidance panel 1, display screen 2, power light 3, system state indicator 4, malfunction indicator lamp 5, trip button 6, power switch 7, SR 8, gravity treatment button 9, function button 10, the button 11 that moves to right, the button 12 that moves to left, downward modulation button 13, rise button 14, installing plate 15, mounting hole 16, capture card 17; Slot 18, input interface 19, power module 20; Mainboard 21, communication interface 22, back plate 23; Output interface 24, supply socket 25, side plate 26; USB interface 27, RS232/485 interface 28, debugging interface 29 is formed; Guidance panel 1 is installed display screen 2, power light 3, system state indicator 4, malfunction indicator lamp 5, trip button 6, power switch 7, SR 8, gravity treatment button 9, function button 10, the button 11 that moves to right, the button 12 that moves to left, downward modulation button 13 above, is raised button 14 in the front; The both sides of guidance panel 1 are installing plate 15, open mounting hole 16 on the installing plate; All devices on the guidance panel are connected with mainboard 21 through lead, bottom mainboard 21 is fixed in, and fixedly electron device and slot 18 above; Capture card 17 can freely inject slot 18; Mainboard one side end is placed power module 20, dress input interface 19 in plate 23 middle parts behind the back side, and the bottom is output interface 24 and supply socket 25; Fixed telecommunication interface 22 on the side plate 26, dress USB interface 27, RS232/485 interface 28 and debugging interface 29 above.
The L type is made in the end of capture card 17.
Described guidance panel 1, display screen 2, power light 3, system state indicator 4, malfunction indicator lamp 5, trip button 6, power switch 7, SR 8, gravity treatment button 9, function button 10, the button 11 that moves to right, the button 12 that moves to left, downward modulation button 13, raise button 14, installing plate 15, mounting hole 16, capture card 17; Slot 18, input interface 19, power module 20; Mainboard 21, communication interface 22, back plate 23; Output interface 24, supply socket 25, side plate 26; USB interface 27, RS232/485 interface 28, debugging interface 29 all are commercially available common components.
The beneficial effect of the utility model: utilize the voltage and current signal on the circuit; Calculate instantaneous power; When system's generation single-phase earthing, select faulty line through the variable quantity of instantaneous energy on each circuit of comprehensive compare of analysis, and show failure message; Send alerting signal and trip signal, advantage such as having intelligent trouble route selection, function can expansion, compact conformation, easy to operate, practicality.
Description of drawings
Fig. 1 is the utility model front elevational schematic;
Fig. 2 is the utility model schematic top plan view;
Fig. 3 is the utility model schematic rear view;
Fig. 4 is the utility model schematic side view;
Fig. 5 is the utility model principle of work block diagram.
Among the figure: 1-guidance panel, 2-display screen, 3-power lights, the normal pilot lamp of 4-system, 5-line fault pilot lamp, 6-trip button; 7-power switch, 8-SR, 9-gravity treatment button, 10-function button, the 11-button that moves to right, the 12-button that moves to left; 13-reduces button, and 14-raises button, 15-installing plate, 16-mounting hole, 17-capture card, 18-slot; The 19-input interface, 20-power module, 21-mainboard, 22-communication interface, plate behind the 23-, 24-output interface; The 25-supply socket, 26-side plate, 27-USB interface, 28-RS232/485 interface, 29-debugging interface.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further, but the utility model is not limited to said content.
As shown in Figure 1: the utility model fault line selection device is by signal input interface, collection plate, and mainboard, PORT COM, display screen, guidance panel, output interface, power module is formed.Guidance panel 1 is realized man-machine interaction, display screen 2, power light 3, system state indicator 4, malfunction indicator lamp 5, trip button 6, power switch 7, SR 8, gravity treatment button 9, function button 10, the button 11 that moves to right, the button 12 that moves to left, downward modulation button 13 is installed above, is raised button 14; The both sides of guidance panel 1 are installing plate 15, open mounting hole 16 on the installing plate, so that whole device is installed on the spot.
As shown in Figure 2: in this fault line selection device, all devices on the guidance panel carry out the signal transmission through lead and mainboard 21; 21 of mainboards and bottom of device are placed some slots 18 above; Capture card 17 can freely inject slot, and the end of capture card makes the L type, leans on rear face packing input interface 19; Mainboard 21 right-hand member discharge source modules 20 are for complete machine provides power supply; Mainboard left side dress communication interface 22.
As shown in Figure 3: in this fault line selection device, the back side is back plate 23, above opening and expose input interface 19; Input interface 19 is some connection terminals, is used to connect the signal wire from electrical network; Back plate 23 bottoms dress output interface 24 is used to export trip signal, realizes route protection; The lower right corner dress supply socket 25 of back plate 23 is the complete machine power supply.
As shown in Figure 4: communication interface 22 is fixed on the side plate 26, and communication interface comprises USB interface 27, RS232/485 interface 28 and debugging interface 29; Interface 27 can be accepted message, carries out the gps clock check and correction, and deposits data in External memory equipment; Interface 28 is used for and the outer computer communication; Use during 29 machine program debugs of interface.
The principle of work of the utility model: will carry out the range of decrease and High frequency filter from the voltage and current signal of each bar line voltage distribution mutual inductor summation current transformer of electrical network and handle; Utilize capture card 17 to carry out synchronized sampling then; And sampled data is sent into mainboard 21 give display screen to show data on the one hand, on the one hand each road sampled data is calculated.When finding system's generation earth fault, calculate ANOMALOUS VARIATIONS trend in the outstanding transient state transition through coupling, adopt multiple algorithm to the analysis that compares of the data of each circuit, select faulty line through analysis-by-synthesis; Send display screen to show, while record trouble signal, concurrent being out of order reported to the police and trip signal, and the function of realization comprises: signal record ripple; Numerical evaluation, earthing wire-selecting, protection tripping operation; Differentiate unusually fault alarm, record queries and communication function.
The course of work of the utility model: power lead inserts supply socket 25, energized switch 7, and power lights 3 is bright, complete machine self check simultaneously, system just often signal lamp 4 is bright; Click function button 10, master menu appears in display screen 2, through operation down key 13, rise key 14, the key 11 that moves to right, the key 12 that moves to left, can get into submenu and carry out system clock setting, systematic parameter setting respectively; When electrical network did not break down, the display screen circulation showed that each line voltage distribution current wave is capable; When system broke down, pilot lamp 5 was bright, showed fault type simultaneously, if not singlephase earth fault, operation SR 8 lets device calculate once more and judges, and the result is shown; If the generation singlephase earth fault, pilot lamp 5 is bright, and display screen shows the faulty line of selecting simultaneously, and prepares time-delay and transfer lock, and operation check button 9 installs route selection again once, and shows the gravity treatment result; At this moment; Operation push-button 10 can get into single algorithm route selection function; Each single route selection criterion icon appears in display screen; Operation move to right button 11, the button 12 that moves to left, downward modulation button 13, raise button 14 and carry out single algorithm route selection, through computing repeatedly, repeatedly judge faulty line after, action button 6 is sent trip signal; If do not carry out artificial final election, send trip signal automatically through time-delay.
The utility model describes through the practical implementation process; Under the situation that does not break away from the utility model scope; Can also carry out various conversion and be equal to replacement the utility model patent; Therefore, the utility model patent is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the utility model Patent right requirement scope.
Claims (2)
1. resonance grounding electric network single-phase earth fault line selection apparatus is characterized in that: fault line selection device by guidance panel (1), display screen (2), power light (3), system state indicator (4), malfunction indicator lamp (5), trip button (6), power switch (7), SR (8), gravity treatment button (9), function button (10), the button that moves to right (11), the button that moves to left (12), downward modulation button (13), raise button (14), installing plate (15), mounting hole (16); Capture card (17), slot (18), input interface (19); Power module (20); Mainboard (21), communication interface (22), back plate (23); Output interface (24); Supply socket (25), side plate (26), USB interface (27); RS232/485 interface (28), debugging interface (29) is formed; Guidance panel (1) is installed display screen (2), power light (3), system state indicator (4), malfunction indicator lamp (5), trip button (6), power switch (7), SR (8), gravity treatment button (9), function button (10), the button that moves to right (11), the button that moves to left (12), downward modulation button (13) above, is raised button (14) in the front; The both sides of guidance panel (1) are installing plate (15), open mounting hole (16) on the installing plate, and all devices on the guidance panel are connected with mainboard (21) through lead; Mainboard (21) is fixed in the bottom; Place electron device and slot (18) above, capture card (17) can freely inject slot (18), and mainboard one side end is placed power module (20); Plate behind the back side (23) middle part dress input interface (19); The bottom is output interface (24) and supply socket (25), and side plate (26) is gone up fixed telecommunication interface (22), adorns USB interface (27), RS232/485 interface (28) and debugging interface (29) above.
2. fault line selection device according to claim 1 is characterized in that: the L type is made in the end of capture card (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220251347.XU CN202583394U (en) | 2012-05-31 | 2012-05-31 | Electrical network earth fault line-selecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220251347.XU CN202583394U (en) | 2012-05-31 | 2012-05-31 | Electrical network earth fault line-selecting device |
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| Publication Number | Publication Date |
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| CN202583394U true CN202583394U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220251347.XU Expired - Fee Related CN202583394U (en) | 2012-05-31 | 2012-05-31 | Electrical network earth fault line-selecting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472348A (en) * | 2013-03-27 | 2013-12-25 | 昆明理工大学 | Instantaneous-power-based single phase ground fault line selection method of resonant grounded system |
| CN104330725A (en) * | 2014-10-22 | 2015-02-04 | 南京工程学院 | Sound and light alarm device for substation circuit breaker fault tripping |
| CN107271834A (en) * | 2017-07-04 | 2017-10-20 | 合肥东玖电气有限公司 | A kind of safe Small Electric Current Earthing And Routing Device |
| CN113692170A (en) * | 2021-08-20 | 2021-11-23 | 青岛鼎信通讯股份有限公司 | Line-to-line relation recognition equipment |
-
2012
- 2012-05-31 CN CN201220251347.XU patent/CN202583394U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472348A (en) * | 2013-03-27 | 2013-12-25 | 昆明理工大学 | Instantaneous-power-based single phase ground fault line selection method of resonant grounded system |
| CN104330725A (en) * | 2014-10-22 | 2015-02-04 | 南京工程学院 | Sound and light alarm device for substation circuit breaker fault tripping |
| CN107271834A (en) * | 2017-07-04 | 2017-10-20 | 合肥东玖电气有限公司 | A kind of safe Small Electric Current Earthing And Routing Device |
| CN113692170A (en) * | 2021-08-20 | 2021-11-23 | 青岛鼎信通讯股份有限公司 | Line-to-line relation recognition equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150531 |
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| EXPY | Termination of patent right or utility model |